#include <iostream>
using namespace std;
void merge(int *arr1, int size1, int *arr2, int size2, int *ans)
{
	  int i = 0 ;
	 int j = 0;
	 int k=0;
    
    
	 while(i+j<size1+size2||k<size1+size2){
	   if(i==size1){
	     
	     ans[k]=arr2[j];
	     k++;
	     j++;
            
	   }
        else if(j==size2){
	       ans[k]=arr1[i];
	       k++;
	       i++;
	   }
	   
	   else if(arr1[i]<arr2[j]){
	     ans[k]=arr1[i];
	     i++;
	     k++;
	   }
	   else if(arr1[i]>arr2[j]){
	     ans[k]=arr2[j];
	     j++;
	     k++;
	   }
	   else {
	     ans[k]=arr1[i];
	     ans[k+1]=arr2[j];
	     i++;
	     j++;
	     k=k+2;
	     
	   }
	  
	  
	   
	 }

}

int main() 
{
    int t;
	cin >> t;
	
	while (t--)
	{
		int size1;
		cin >> size1;

		int *arr1 = new int[size1];

		for (int i = 0; i < size1; i++)
		{
			cin >> arr1[i];
		}

		int size2;
		cin >> size2;

		int *arr2 = new int[size2];

		for (int i = 0; i < size2; i++)
		{
			cin >> arr2[i];
		}

		int *ans = new int[size1 + size2];

		merge(arr1, size1, arr2, size2, ans);

		for (int i = 0; i < size1 + size2; i++)
		{
			cout << ans[i] << " ";
		}

		cout << endl;
		delete[] arr1;
		delete[] arr2;
		delete[] ans;
    return 0;
	}
}
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C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}